| 摘要 |
<p>The drawing board has a guide on a side edge for a flat drawing ruler, and a hinge, which extends parallel to the side edge, to divide the board into an inner and an outer section. The board has two integral parallel film hinges the upper surfaces of which are within the drawing surface, when inner and outer sections are within the same plane. The hinges are located at a distance which corresponds to the max. material thickness of the inner and the outer section. The Surfaces neighbouring the hinges, and extending towards the lower side of the board, each enclose an angle of at, least 90 deg.</p> |
